When washing bras the best way to wash the bras to get them really clean is to hand wash the bras.
However you do not really have to hand wash your bras if you do not want too.
I have washed my bras in the washing machine and never had any issues.
The washing machine will wash the bras just fine without doing any damage to your bras.
I just throw the bras in the washing machine without any other clothes and add my regular laundry detergent.
I just fill the washing machine up at the lowest setting and wash a few bras alone and they come out just as clean as they would if washed by hand.
I used to wash my bras by hand but doing so was too tedious and I decided to start using the washing machine for washing my bras and will continue to do so.